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A train on a straight stretch of track starts from rest and accelerates at a steady 2 m/s/s. Determine its speed after 1 second, 2 seconds, and 5 seconds.

Question

A train on a straight stretch of track starts from rest and accelerates at a steady 2 m/s/s. Determine its speed after 1 second, 2 seconds, and 5 seconds.

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Solution

Para resolver este problema, utilizaremos la fórmula de la velocidad en función del tiempo para un objeto que acelera de manera constante. La fórmula es:

v=u+at v = u + at

donde:

  • v v es la velocidad final,
  • u u es la velocidad inicial,
  • a a es la aceleración,
  • t t es el tiempo.

Dado que el tren comienza desde el reposo, u=0 u = 0 . La aceleración a a es de 2 m/s².

  1. Después de 1 segundo: v=0+(2m/s2×1s) v = 0 + (2 \, \text{m/s}^2 \times 1 \, \text{s}) v=2m/s v = 2 \, \text{m/s}

  2. Después de 2 segundos: v=0+(2m/s2×2s) v = 0 + (2 \, \text{m/s}^2 \times 2 \, \text{s}) v=4m/s v = 4 \, \text{m/s}

  3. Después de 5 segundos: v=0+(2m/s2×5s) v = 0 + (2 \, \text{m/s}^2 \times 5 \, \text{s}) v=10m/s v = 10 \, \text{m/s}

Por lo tanto, la velocidad del tren después de 1 segundo es 2 m/s, después de 2 segundos es 4 m/s, y después de 5 segundos es 10 m/s.

This problem has been solved

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